"Whence" (and "hence") already contains the idea of "from", just as "hither" and "thither" contain the idea of "to". "Whence do you come?" would be fine, but you might as well go the whole hog and say "Whence comest thou?"
I know not whence I come or whither I go. I don't know whether I'm coming or going...
Good choice! :) The word ended up as «suburra» in Italian, and now means "slum" in Italian. For curious students, Subura/Suburra was a down-at-heel area in Ancient Rome, apparently it was very seedy, its dwellers lived in «insulae», kind of cheap apartment buidlings with «tabernae» on the ground floor. The ancient equivalent of living in an apartment building with a hostel or shop on the ground floor!: https://en.wikipedia.org/wiki/Suburra